Aircraft cable weak fault diagnosis method

Abstract

The invention discloses a weak fault diagnosis method for an aircraft cable. The method comprises steps that detection equipment built based on a virtual instrument technology collects reflected signals of the aircraft cable; the collected reflection signals are processed through improved variational mode decomposition; short-time Fourier transform is conducted on the decomposed intrinsic mode component containing the fault information; time-frequency energy of the intrinsic mode component subjected to the short-time Fourier transform is redistributed by using a rearrangement spectrogram method, and the time-frequency energy is distributed to a gravity center position; and then time energy information is extracted to draw a fault information curve of the aircraft cable, and whether the aircraft cable has a weak fault is diagnosed from an energy angle. The method is advantaged in that a problem that a traditional spread spectrum time domain reflection method cannot effectively detect weak faults is solved, diagnosis of the weak faults of the aircraft cable is achieved, the early warning capacity and the detection rate of the weak faults of the aircraft cable are improved, and support is provided for maintenance of the aircraft cable.

Description

technical field [0001] The invention belongs to the field of fault diagnosis of aircraft cables, in particular to a method for diagnosing weak faults of aircraft cables. Background technique [0002] Aircraft cables are an important part of the aircraft, and are usually distributed in multiple locations such as the cockpit, engine compartment, wing, and cabin inner wall interlayer. They can transmit electrical energy to various systems of the aircraft and realize information transmission between different systems. More electric aircraft and all-electric aircraft are the main trend of current aircraft development. Electric energy will replace air source and hydraulic pressure as the power source of aircraft starting, braking, deicing, landing gear and other systems. Therefore, the number and types of aircraft cables will become more and more more and more. In the process of aircraft assembly manufacturing and operation and maintenance, the problem of cable-related failures h...

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Problems solved by technology

[0005] In view of the deficiencies in the above-mentioned technologies, the purpose of the present invention is to provide a weak fault diagnosis method for aircraft cables that can accurately diagnose aircraft cables during aircraft cable fault diagnosis, which is a weak fault diagnosis method for aircraft cables based on enhanced spread spectrum time domain reflection , which solves the problem that the traditional spread spectrum time domain reflection method cannot diagnose weak faults of aircraft cables, and has great engineering application value for weak fault diagnosis of cables

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